Impeller for impact crusher



JunS 26, 1956 c, ADAMs 2,752,098

IMPELLER FOR IMPACT CRUSHER Filed Aug. 9, 1954 ATTORNEYS United StatesPatent llVIPELLER FOR IMPACT CRUSHER Charles A. Adams, Wurtsboro, N. Y.

Application August 9, 1954, Serial No. 448,571

2 Claims. (Cl. 241-197) My invention relates to an impact crusher, andmore particularly to a wear plate and means for securing the same inplace.

This invention is an improvement on that shown in my copendingapplication, Serial No. 398,775, filed December 17, 1953.

In the impact crusher referred to, there is a rotatable impeller,preferably rotatable on a vertical axis, and there are vanes or wearplates or shoes for carrying the material outwardly under the action ofcentrifugal force and discharging the same against anvils or breakerplates. The impeller blades or plates include Wear plates or shoes,because crushable material flowing over the impeller blades wears theplates down so that they require replacement.

It is the principal object of my invention to provide an improved wearplate or shoe in an impact crusher.

It is another object to provide improved means for simply yet securelyholding wear plates or shoes rigidly in place on an impeller.

Another object is to provide improved securing means for securing a wearplate to an impeller blade, so arranged that the wear plate is acted onby centrifugal force in such a way as to make the wear plate hold moresecurely the faster the rotation of the impeller.

Other objects and features of novelty will be hereinafter pointed out orwill become apparent to those skilled in the art.

In the drawings, which show, for illustrative purposes, only, apreferred form of the invention:

Fig. l is a top plan view of an impeller for an impact crusherillustrating the invention; and

Fig. 2 is a side elevation of the impeller shown in Fig. 1, parts beingbroken away.

In an impact crusher of the character indicated, there is a rotatableimpeller having impeller blades which guide or conduct crushablematerial outwardly under the action of centrifugal force, and there areanvils or breaker plates surrounding the impeller so that the crushablematerial is cast forcibly against the anvils or breaker plates so as tocrush the material.

The present invention, as stated, is in the nature of an improvement onmy copending application, identified above, to which applicationreference is made for a fuller description of certain parts of thepresent invention.

In said drawings, there is illustrated an impeller 5, which may comprisea vertical impeller shaft 6 having a plate hub 7 thereon. A bottomimpeller plate 8 is secured as by means of bolts or the like 9 to thehub 7 of the impeller. The impeller has renewable bottom Wear plates orliners 10 resting on and secured to the impeller plate or disk 8. Theimpeller further includes impeller blades and, in the form shown, theseblades consist of 2,752,098 Patented June 26, 1 956 wear plates or shoes11--11, which may rest on the bottom renewable plates or liners 10-10,and which may be secured to blades or upstanding walls on the impellerplate. As illustrated, the wear plates 1111 are secured to upstandingwalls 12, which in the form illustrated constitute legs of angles, thebases 13 of which are secured to the impeller as by means of screws 14,as will be clear. The wear plates 11 are preferably generallyWedge-shaped, and they may have radially extending ribs or serrations 15thereon to assist in guiding the crushable material in its centrifugaltravel from the center to the outer 'periphery of the impeller.

The wear plates 15 are preferably formed of tough hardened steel or thelike, so as to resist wear. However, despite the efforts to avoid wear,the plates 15 do wear out, and I have provided improved means forsecuring them in place on the impeller. My improved means is of such anature that the wear plates may be very readily and quickly applied tothe upstanding walls 12, and may rest on the bottom renewable plates orliners 10. The means for securing the wear plates in place is furthenofsuch a nature that centrifugal force tends to wedge the wear plates intotighter and tighter engagement with the walls 12 and as the speed of theimpeller is increased.

In the form illustrated, the upstanding blades or walls 12 are providedwith openings 16 therein, which are preferably about centrally located.The wear plates 11 are provided with securing means in the form oftongues 17, preferably integral therewith, which tongues are inclinedgenerally radially outwardly so as to hook over the edge 18 of the hole16 and thus more tightly wedge or bind the wear plates to the upstandingplates or blades 12 as the speed of the impeller increases. It will beseen that, with the wear plates 11 resting on the bottom plates orliners 10, a single lug 17 will sufiice to hold the plates 11 securelyin place, and, as stated, as the speed of the impeller is increased sois the holding effect of the wedge lug 17 in the hole 16 of theupstanding plate of the angle.

As is more fully set forth in the copending application aboveidentified, the impeller is enclosed in a casing and there are suitableanvils or breaker plates distributed about the impeller. There is a feedhopper 19 secured above the top plate 20 and provided with a down chute21 for discharging crushable material onto the impeller. The impeller atthe center has a pyramid or cone platform 22, which is designed todistribute the crushable material and force the same off center, so thatit may be acted upon centrifugally and thrown outwardly and crushed.

It will be seen that I have provided an exceedingly simple impeller andsimple improved means for holding the wear plates securely in place, sothat they may be definitely held and yet may be readily removed forreplacement when necessary.

While the invention has been described in considerable detail and apreferred form illustrated, it is to be understood that various changesand modifications may be made within the scope of the invention, asdefined in the appended claims.

I claim:

1. In an impact crusher, a generally vertical shaft, a bottom impellerplate carried by said shaft, an upstanding wall on said impeller plate,said upstanding wall having a hole therethrough, a wear plate fittingagainst said upstanding wall, said wear plate having a laterally andoutwardly extending wedge tongue extending through said hole, said Wedgetongue having forward and rear weidge surfaces engageable with theforward and rear edges of said hole, whereby movement of said wear platein radi ally outward direction will cause said forward wedge surface andengaging edge of hole to wedge said plate into tight engagement withsaid upstanding wall, and radial movement in a radially inward directionwill cause the rearward wedge surface and the rear edge of said hole towedge said wear plate laterally away from said upstanding wall.

2. In the combination defined in claim 1, a bottom wear plate on saidimpeller plate on which said first mentioned wear plate rests.

7 References Cited in the file of this patent UNITED STATES PATENTS

